Whether to take calcium tablets or to take calcium injections depends on the degree of calcium deficiency of the patient, and should be chosen according to the actual situation of the person who needs to take calcium supplements, and what is suitable for him/her is the best. If the degree of calcium deficiency of the patient is mild, such as adolescents who are in the process of development, or the elderly who are calcium deficient, calcium can be replenished by taking calcium tablets or through dietary supplementation. Excessive consumption of calcium tablets may cause constipation and increase the risk of kidney stones, so they should be used carefully according to the condition. If the degree of calcium deficiency is more serious, such as severe hypocalcemia, intravenous calcium supplementation can be carried out in a timely manner to correct hypocalcemia, then at this time you can choose to take calcium injections. When taking calcium injection, injecting too fast will cause local blood calcium concentration to be too high, and when it flows through the heart, it can cause cardiac arrhythmia and even cardiac arrest. Occasionally, adverse reactions such as dry stools and generalized fever occur. If there are any uncomfortable symptoms, you should consult a doctor in time to clarify the cause of the disease and treat it. Whether to take calcium tablets or to take calcium injections should be carefully chosen according to the actual physical condition of the patient.